Question

If a2+1/a2=102, find the value of a-1/a

Answer 1

a2+1/a2=102

substracting 2×a×1/a

a²+1/a²-2×a×1/a=102-2×a×1/a

a²+1/a²-2=102-2                                                            (a and 1/a are canceled)

(a-1/a)²=100

(a-1/a)²=10²

ANS a-1/a=10

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Answer 2

Answer:

10

Step-by-step explanation:

(a-1/a)=102-2=100

100 square root=10

therefore your answer is 10